PDF malware analysis — malicious · 33e53d3d64352324

MALICIOUS

PDF

56.0 KB Created: 2017-11-13 00:17:06 +01:00

MD5: eda269b6c516553f25de99c2300ce0ad SHA-1: 7561e437a77324a038a95df2c2e368530eb90ec6 SHA-256: 33e53d3d643523247d9eacc1ed8ee613491e4b3652f74f1d1510fd00b1a2f377

248 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file exhibits multiple critical heuristic firings related to JavaScript exploits and XFA forms, indicating it's designed to exploit vulnerabilities. The presence of PDF_JS_EXPLOIT_CLUSTER and PDF_EVAL strongly suggests the execution of malicious JavaScript code. ClamAV detection as 'Pdf.Dropper.Agent-7247412-0' further confirms its malicious nature, likely acting as a dropper for further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9609

Heuristics 11

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Pdf.Dropper.Agent-7247412-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7247412-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Embedded script payload in PDF stream low PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
AcroForm button with action trigger low PDF_ACROFORM_BUTTON

PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/3.0/
- http://www.xfa.org/schema/xfa-template/3.0/
- http://www.xfa.org/schema/xfa-data/1.0/
- http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0029.bin` `ddb2f0273ff53a78cba698afed0c23add8e219eaa85fecd99611493bebdb4d27`	pdf-embedded-file	PDF EmbeddedFile object 29 at offset 0xD373	1237 bytes
`objstm_0035_00.bin` `eeb69e2dadfa00e86ba6af0e6cb511413051e5b08feb63db3edbb93a1dcfb2ad`	pdf-objstm-decoded	PDF /ObjStm 35 0 obj (inflated)	1283 bytes

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